System of electric-motor control.



if o, 8755-581. lDATENTED DEG. Sly U07:

H, IAM 1S. SYSTEM OF ELECTRIC MDTOR CONTROL,

APPLIGATION lILED MAY 6,10074 MA, if W ENVENOR p Q@ M A URNEY oooe Speed eguhltion is required, is Supplied tion of @mit omet Tm AM A, SSIGNQR TO WES'FNGHGUSE ELECT exif-3 Patent.

Patented, Iee. E., i907..

t e ed States, and o restaient w :o 'the bounty if Aiegheny owented o l 3W oud .nventon .lj/.filetes to systems of electric mmol' control, and has epeoimle'o'enoo to iov oogtro of direct ouvrent mo .ich me 'Supplied with enolgy from witzige sourses. e ohg'eet mi my svoetoos toplovide proved meen@ fol" oonl dug the moet xd epeed reguotiom of eeotto motore.

eote motore etre or ptoyed fol" O*. oete moo. ioery", et. h es it Poodt press, it is epeoov dosmbo to "".e eutoozmto moons for e outing u, dos@ detoo. whioff.; @had rosgoud to o ,ne switohi g device. Posh button. w may be, odveutogeouey employed poise and e number of groups; o t..e 1 @eee may be stetioned ot 'varouf points about the muohio-e for the oonven of im attendant, since it :is often neces'- ery to bring the muohio@ to 'rest in Very eholt time to avoid njuzy.

The syetom. of my plesent invention elobodes t oon'lpoundV Wound. eleetro `moto? that euppied with. ene/yg? from a mutf .f'otoge eoooo amd is provided with. orme ture :lod ed l'esistenoes toy oootoing its moderation and speed rogulotou. A pw of electrically operated switchen@ me provided for 'ovorming the armature regioteooe md for ohongng the motor fromthe orout o' one voitego to the circuit of mf? voigtafm, and o, iia'Lotor-drven'master do?" govoloe the 'ed resistance and the mation of' the oontyo swtohee, 'the pilot .figure of the eooompanyllg diwri'og i... diagrenmmto View of o system constructed and :wronged in aoc/ordeno@ with my iovootjon.

Ao -electric motor 1', 'to be employed in dzviig moohnory for whoh o relotvey with eleotxoal energy from positvolino 0,0117 duetoye f2 :md 3 o unhke voltage, o onoult boing; eompeted through e single negative ee conductunl et. The motor comp es ennemie' 5 and o shunt efd magi/.let Wmdng '.o circuit of the olmoturo 5 is peo" ed .with a 'esstexoe 6 which may be "mied by o goeie@ of control switches 7 8, 9, i0, llt, i2 and 13 and the circuit o5", the shunt field magnet winding 6 is :provided with a. eeiwenoe M Whol., togethe with the oontfol. ewtohes', is governed by at moete? Switch y "ibo meto Sw'toh 'is gof/erned by o pot mot-oi` i@ which, in. tum, ie oontroled The pils'b-futtim ewtoifee l? ond 18. ope/oido line oonduoton to which' the motois ooelooted is determined by ewtdxos Q, 2G :md i that ae governed by ohougwove Switch 22 which fon- :L port of the oon troo? i5.

' The.pilotdfnotol l@ may' of :my suitable size oud. type and, as lus'tm'ted o. commi toto? mo tor having a. shunt field magnet w ioding 23 and is provided with o eestenoe 2li that detelmnes the dreotion o1" rotation of the motor in conjunction with the push-button switches l? md i8 and o paix' oi" limit ewitohes 25 end 26. The moete? oontroe' i5 is equipped with two groups of stotoumjy Contact membee Z7 and 28 'which me rosee# tively connect-ed to the actuating; Hmgnet windings of the eol'ltro switches 8, Q, G, M eind i2 and to end end intennedate points in the resistance M. A movabe oontaot mim 2 is adapted to engage the stationnfy contact members and is l'ototed, together with a. disk o1 plete 3U, by the motor 1,6.

The lototebo disk 30 is provided with p1o.

jeotdg pins 31 and 'to engage notches in the porlphery of o com 33, winch 15s-adopted to drive a rotatable member Se of the change I ove: switch 22.

The opoxation of, and the oeliit connections fol, theA system are ae fooWe: Assumng that tho control swtohee are open :md

that the moete/1* oontolie oooupes its "o position o, the moto!` l may be accelerated ov ooeng the switch 17. lThe switch 2 closed independently of' the switch i7 when the ma@ ,er switch occupies its of position., Since the 'oiouit is completed through the actuating magnet Winding 35 ffom positive line conductor 3 through cond duotor 3G, magnet Winding 35, conductor 37, statonm'y oo otoot member 23212 of the changecontact atm 34 and oonduc toys 39 et@ to negative line conductor 4.

tif:

soon as the switch 2l is closed thc circuit ch couiplctcd through its magnet Wind- 35 is mode indcpenclcnt of the changeo.i r switch 22 und is cs'iu-blislicil from conductor Si? through the Windingr 35, stationary contar-1; nienibci's Ll1 (which nrc bridged by movable Contact inoniber 42 when switch 21 is clcsedy, wuilucror 43 und c. push-buttiin switch i4, which is norninliy closed by spring i-, to tho nnignet line conductor 4. ln this way, it is impossible to close the switch 2E unless the muster controller occupies it oll' position. which indicates that the armature rcsistnnce slloit-circuiting svfitclics nrc oncn and that thc field resist- :uirc is excluded troni the circuit, but, :is soon its thc switch 21 is closed, it may bc hold in this, position independently of the changeo wr switch 22, the master controller bei" r then dependent upon the puslrbutton switch it. so that the connection troni the motor to tive line. conductor may be intcrthe ner` ucd any time by opening the switch 44.

' thc smtchcs i? and 2i both closed, cirilished from the lino conductor 3 conductor 4S, s small section 4:7 of i tuncc conductor 48, limit switch c' nductor 4), stationary contact Vieni# 5f.) (which :tre engaged ,by n. bridging n inber 51 "when the, switch 2l. is #c iductor 52, switch i?, conductor En, conductor 54, section oi the. :ind conductor 40. to the nousi une conductor 4. Energy is thus sun l to thc motor i6 which inipnrts s ciccio rotation to the. movable Contact arm 29 disk 539 of the muster controller i5. :rolicr ztrni 2Q first moves into enuent with contsct ring segment 56, e@ ishes circuit from tho line conductor 3 hugh conductor 16, iicid magnet Windingr l of 'the moto@` i. conductor 5?, ring segmcnt il? und conductor totho Jrfnit :above traced shows that the .rini'ling ot the motor is first in, line uit-hout ilield @with tion -wing thc motor. The first cont m 2? und. thc rclutfion oi thc Contact arm ngewiver switch in u direction by reason of thc pin 'pr' icction 5&2 with 'f 'This nctuation l slics en gement .'34 with :t ring?, scgnicnt suqurnce. this cncfsggcnicnt, at vibsishcil *""oni liuc conductor 3 through :nzinoi wim .nef 5i) or" the switch i9, coniluifftor tilt ringr scfinent contact arm i-i, coniloctv-s's iii andl to the negative lin(` conductor f1. motor circuit is cstztb# lished is soon thv `switch iff closed, from thc lino coiuluigtor L -started i'roin thc loww'oltugc source, with the,

nrinuturc resistance. 6 includcd in thc circuit. und thc iielil msgnct winding will be excited to s maximum degrcc from thc sourcev of higher Voltage. As the contact nrrn 29 continucs to :novo in the saine direction, it successively engages stationary Contact ineinbcrs G1, 6L?, 63, 64 and cnd, in conscquence ol' this engagement, the switches 8, 9, l0, 11 and l2 :ire successively closed. Those. contact mcinhers are located relatively ucar together so that the Contact arm, in passing; from one member to the next adjacent meniber, is itlways in engagement with some one or more of the members. In this way, the i'csistsncc 6 is gradually shortfcircuited and the short-circuiting switches are permitted to o en as soon as the next adjacent switch is c oscd.

Before the Contact arm 29 is disengaged from the stationary contact member the pin projection 31 from the disk 30 engages the notched com 33 to give it another slight movement of rotation, sufiicient to move the contsct crm 84 into en agement with contract ringr segment 66. y this engagement, circuit is cstnblishdfrom line conductor 3 through conductor 36, magnet winding 67 of thc switch 20, conductor- 68, scgmcnt, Contact arm 34, and conductors 39 and 40 to the. ncgntiyc. iine conductor 4. When the svn-.tch 2() is closed, a circuit is established directly from the line conductor 2 through this switch und the armature 5 of the motor l. to the negative line. conductmfthe irmature resistance being excluded from the circuit. These armature circuit connections ure ni" taincd While the `arm 29 of the nuts-tsr controller continues in its rotation und passes over the group 28 of stationary contact members which are connected to the field resistance. 14. The resistance of the field circuit is, in this-way, gradually increased, thereby increasing the s eed of the motor until a maximum is renc led on the lower armature voltage.

The contact arr'n 29 and the disk 30 have now substantiallycompleted one revolution and thc projection 32 engages another notch ,in thc periphery of the cani 33 so that the contact arm 34 of thc change-over svn'tch is moved out of enga ement with the contact ringsT segment. 66 ani into engagement ith s serment GQ. A circuit is nowcompleted from line conductor f through conductor 36, magnet winding '70 of the switch '7 conductor Tft, Contact segment 69, contact strni SSA- und conductors 30 anll 40 to the negativo line conductor 4. The Contact segincn .s 66 und Gt?? nrc bridged temporarily by the cow (which thc ioyfcrl'tiict crm 24, in passing from onc to the other,

circuit interrupter, of a switching device for controllingr the field resistance and the operation ol the control switches, an operating motor for thc. switching device, means for pcfmitting the closure of the circuit interrupter onlv when the. switching device occupies its ofi position, and means dependent upon the opening of the circuit interrupter for automatically returning the switching device to its off position.

4. In a control system, the combination with an electric motor, a suppl)Y circuit, a field resistance, an armature resistance, a plurality of independently-operateil control switches for the armature resistance, anda circuit interrupter, ofa switching device for controlling the field resistance and the operation of the control switches, means for permitting the closure of the circuit intcrrupter only when the switching device occupies its off" position, and means, dependent upon the opening of the ciruit interruptor for automatically returning Jhe switching device to its off position. v

5. In la control system, the combination with an electric motor, a supply circuit, `a field resistance, an. armature resistance, a plurality of independen tly-operated control switches for the armature resistance, and a circuit interrupter,..of a switching device for controlling the field resistance and the operation of the control switches, and means, dependent upon the opening of the circuit interru )ter, for automatically returning the switching device to a predetermined position.

6. In a control system, the combination with a supply circuit, an electric motor having field and armature windings, resistances therefor, a circuit interrupter, and a switching device for controlling the field resistance directly and the armature resistance indirectly, of means for permitting the closure of the circuit interruptor only when the switching device occupies a redeterinined position, and means, dependent upon the opening of the interruptor for automatically returning the switching device to said osition.

7. Inv a control system, the com ination with supply circuits of unlike voltage, an electric motor, an electrically-operated line switch located in the common return circuit, a controller and a driving motor therefor, of means for permitting7 the closure of the line switch when the controller occupies a predetermined position, and means, dependent upon the opening of the line switch, for automatically moving the controller to said predetermined position.

8. In a control system, the combination with a suppl r circuit, an electric motor having armature and field magnet windings, re.-

sistances therefor, an electrically-operatrici' line switch, a series of inde pendently-operated control switches for the armature resistance, a switching device for varying the field resistance and controlling the independentlyoperatcd switches, and an electric driving motor for the switching device, of means for permitting the closure of the line switch only when the switching device occupies a predetermined position, and means, de endent upon the opening of the line. switch, or automatically moving the controller to said predetermined position.

9. In a control system, the combination with supply circuits of unlike voltage, an electric motor having a shunt field magnet winding and an amature winding, and field and armature resistance's, of independently-operated switches forI controlling the supply circuit and resistance connections, a master switch for governing the control switches and the field resistance, and "automatic means for suspending the operation of the master switch.

10. In a control system, the combination with supply circuits of unlike voltage, an

electric motor having a shunt field magnet winding and an amature winding, and field and armature resistances, of independentlyoperated switches -for controlling the sup ly circuit and resistance connections, and) a switching device for varying the field resist- A ance and controlling the action of the independent switches, an electric driving motor therefor, and manually-operated means for controlling the driving motor.

11. In a'controlsystem, the combination with supply circuits of unlike voltage, an electric motor having a shunt field magnet winding and an amature winding, and field and armature resistances, of independentlyoperated switches for controlling the supply circuit and resistance connections, an( a switching device for varying the field resistance and controlling the action 'of the independent switches, an electric driving motor therefor and automatic and manually-operated means for controlling the driving motor.

12, In a control system, the combination with supply circuits of unlike voltage, an electric motor having a shunt field magnet winding and an armature winding, and field and armature resistances, and an auxiliary motor, of means driven therebyfor automatically connecting the field magnet winding to the higher voltage source, thev motor armature and the-armature resistance to the low voltage source, short-circuiting the amature resistance, introducing resistance in the field circuit, short-circuiting the field resistance and connecting thc armaturoand the armature resistance to the higher-voltage source short-circuiting the armature resistance and re-introducing the field resistancefand moans for automatically suspending the operation of the auxiliary motor.

13. In a control system, the combination with supply` circuits of unlike voltage, and an electric motor having armature and field magim mutma py enfuit/s am:

m motor" having @et Wmdmgs, supply mg a, @Ummm x n a A @Hummm f the mmm ture wim wees, 01 oo'um l Subscribed my name this 29th nii-ay of April HENRY 1D. JAMES. W itnesses:

.ROSS W. COPELAND,

Bumm' HINES. 

